Howaed m



(No Model.)

H. M. SMITH.

EXHAUST NOZZLE FOR LOCOMOTIVES.

NO. 339,226. Patented Apr. 6, 1886.-

Jiawnton N. PETERS. mwmm w. Wmhington. 0.1;

l TE STA PATENT OFFICE.

HOVARD liI. SMITH, OF ST. LOUIS, MISSOURI.

EXHAUST -NOZZLE FOR LOCOMOTIVES.

SPECIFICATION forming part of Letters Patent No. 339,226, dated April 6,1886.

Application filed September 30, 1884. Serial No. 144,355. (No model.)

To aZZ whom it may concern:

Be it known that I, HOWARD M. SMITH, of St. Louis, Missouri, have made anew and useful Improvement in Exhaust -Nozzles for Locomotives, of whichthe following is a full, clear, and exact description, sufficient toenable others skilled in the class of construction to which theimprovement relates to make and use the same.

The aim and effect of the improvement, which consists in providing thenozzle with an additional outlet or outlets, through which the steam canexhaust, is to improve the draft in the stack and relieve theenginecylinders.

The mechanism adopted for carrying out the improvement is shown in theannexed drawings, in which Figure 1 is a vertical cross-section of aloeomotive-boiler having the improvement, the nozzle being shown inelevation, and only those parts being exhibited which are essential toan understanding of the construction; Fig. 2, a vertical section, uponan enlarged scale, of the nozzle; Fig. 3, a top view of the nozzle; Fig.4 a horizontal section on the line 4 i of Fig. 2, and Fig. 5 ahorizontal section on the line 5 5 of Fig. 2.

The same letters of reference denote the same parts.

A, Fig. 1, represents the boiler of the locomotive. B represents thestack, and C 0 represent the exhaustpipes which lead from the cylinders,respectively. All of these parts are of the customary form.

D represents the exhaust-nozzle. It occupies the usual place, and thepipes C C are adapted to discharge the exhaust-steam into it in theusual manner. The exhaust-nozzle, however, in place of having but asingle passage through which the steam can be delivered into the stackor through which it can escape, has more than one passage-that is tosay, the nozzle, in addition to the central passage, d, has the passaged, and this lastnamed passage is in an annular form, surrounding thepassage d and communicating The steam current then divides, a portioncontinuing upward through the central passage, d, and a portion passinginto the annular chamber (1, thence to be discharged through the outlet(1", and from the nozzle both currents pass into the stack.

To give proper velocity to the steam as it passes from the annularchamber d, the exit of said chamber should be sharply contracted. Themeans which I have devised for this purpose consist of an outwardlyturned beveled flange, 0, upon the upper edge of the inner shell of thenozzle, and an inwardly-turned beveled flange, f, formed upon thecorresponding edge of the outer shell and on a level with the flange ewhen the two shells are fitted together. At 9 is shown the joint betweensaid parts, accurately made, so that when the parts are in position asmall and even annular space is left all around the nozzle. v I am awarethat exhaust-nozzles have heretofore been made with two or morepassages, and I therefore do not claim such a nozzle, broadly; nor do Iclaim a nozzle having a contracted annular opening; but

\Vhat I claim is In an exhaust -,nozzle, the combination of the innerand outer shells combined to form an annular chamber, (1, the innershell being provided with upwardlydnclined apertures d", leading intosaid chamber, and one or both shells having a flange for sharplycontracting the annular exit from said chamber, substantially as setforth.

HOXVARD M. SMITH.

\Vitnesses:

G. D. MoonY, J. W. HOKE.

